Astral Multiflow Return Inlet - 63mm Metric External Thread
The eyeball has been marked with a series of "knock-outs" at 14, 20, and 25 mm, enabling the required flow to be selected at the time of installation. 
Recommended max flow 4 m/sec., complies with UNE 13451-1:

• Ø 14= 2,2 m3/h,
• Ø20 = 4,5 m3/h,
• Ø25 = 7 m3/h.
• To glue onto Ø 63 mm, outside 6 bar pipe and inside Ø 50 mm.
• Made in white ABS.
• Can be installed with wall conduits: 15661-15660.
• Grille slots are < 8 mm.
• Complies with UNE 13451-1.

The inlets return the filtered, disinfected water to the pool. They should be placed on the wall facing the skimmers or at the bottom of the pool to prevent dirt from settling.